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      <a id="pvslock"></a>
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        <h2>
          <span class="refentrytitle">pvslock</span>
        </h2>
        <p>pvslock — 
      Frequency lock an input fsig
    </p>
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      <div class="refsect1">
        <a id="idp139262400"></a>
        <h2>Description</h2>
        <p>
      This opcode searches for spectral peaks and then locks the frequencies around those peaks. This is similar to
      phase-locking in non-streaming PV processing. It can be used to improve timestretching and pitch-shifting quality in
      PV processing.
    </p>
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      <div class="refsect1">
        <a id="idp139323664"></a>
        <h2>Syntax</h2>
        <pre class="synopsis">fsig <span class="command"><strong>pvslock</strong></span> fsigin, klock</pre>
      </div>
      <div class="refsect1">
        <a id="idp139325776"></a>
        <h2>Performance</h2>
        <p>
      <span class="emphasis"><em>fsig</em></span> -- output pv stream
    </p>
        <p>
      <span class="emphasis"><em>fsigin</em></span> -- input pv stream.
    </p>
        <p>
      <span class="emphasis"><em>klock</em></span> -- frequency lock, 1 -&gt; lock, 0 -&gt; unlock (bypass).
    </p>
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              <th align="left">Warning</th>
            </tr>
            <tr>
              <td align="left" valign="top">
                <p>
        It is unsafe to use the same f-variable for both input and output of pvs opcodes. Using the same one might lead to undefined behavior on some opcodes. Use a different one on the left and right sides of the opcode.
      </p>
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      <div class="refsect1">
        <a id="idp139330080"></a>
        <h2>Examples</h2>
        <p>
      Here is an example of the pvslock opcode. It uses the file <a class="ulink" href="examples/pvslock.csd" target="_top"><em class="citetitle">pvslock.csd</em></a>.
      </p>
        <div class="example">
          <a id="idp139331936"></a>
          <p class="title">
            <strong>Example 702. Example of the pvslock opcode.</strong>
          </p>
          <div class="example-contents">
            <p>See the sections <a class="link" href="UsingRealTime.html" title="Real-Time Audio"><em class="citetitle">Real-time Audio</em></a> and <a class="link" href="CommandFlags.html" title="Csound command line"><em class="citetitle">Command Line Flags</em></a> for more information on using command line flags.</p>
            <pre class="programlisting">
<span class="csdtag">&lt;CsoundSynthesizer&gt;</span>
<span class="csdtag">&lt;CsOptions&gt;</span>
<span class="comment">; Select audio/midi flags here according to platform</span>
-odac      <span class="comment">;;;realtime audio out</span>
<span class="comment">;-iadc    ;;;uncomment -iadc if realtime audio input is needed too</span>
<span class="comment">; For Non-realtime ouput leave only the line below:</span>
<span class="comment">; -o pvslock.wav -W ;;; for file output any platform</span>
<span class="csdtag">&lt;/CsOptions&gt;</span>
<span class="csdtag">&lt;CsInstruments&gt;</span>

<span class="ohdr">sr</span> <span class="op">=</span> 44100
<span class="ohdr">ksmps</span> <span class="op">=</span> 32
<span class="ohdr">nchnls</span> <span class="op">=</span> 2
<span class="ohdr">0dbfs</span>  <span class="op">=</span> 1

gifil <span class="ohdr">ftgen</span> 0, 0, 0, 1, "fox.wav", 0, 0, 1

<span class="oblock">instr</span> 1

klock	<span class="op">=</span> p4
fsig    <span class="opc">pvstanal</span> 1, 1, 1, gifil	<span class="comment">; no further transformations		</span>
fsigout	<span class="opc">pvslock</span>  fsig, klock	<span class="comment">; lock frequency </span>
aout    <span class="opc">pvsynth</span>  fsigout
        <span class="opc">outs</span>     aout, aout

<span class="oblock">endin</span>
<span class="csdtag">&lt;/CsInstruments&gt;</span>
<span class="csdtag">&lt;CsScore&gt;</span>
          
<span class="stamnt">i</span> 1 0 2.6 1	<span class="comment">; locked</span>
<span class="stamnt">i</span> 1 3 2.6 0	<span class="comment">; not locked     </span>

<span class="stamnt">e</span>
<span class="csdtag">&lt;/CsScore&gt;</span>
<span class="csdtag">&lt;/CsoundSynthesizer&gt;</span>
</pre>
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        <p><br class="example-break" />
    </p>
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      <div class="refsect1">
        <a id="idp139336224"></a>
        <h2>Credits</h2>
        <p>
      </p>
        <table border="0" summary="Simple list" class="simplelist">
          <tr>
            <td>Author: Victor Lazzarini</td>
          </tr>
          <tr>
            <td>November 2004 </td>
          </tr>
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        <p>
    </p>
        <p>New plugin in version 5</p>
        <p>November 2004.</p>
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